50mm Square Axle

50mm Square Axle


Engineered for Quality

SKU: N/A Categories: ,
Couplemate accepts PayPal, Visa and Mastercard.

50mm Square Axle Caravan Trailer Boatmade in australia

50mm square axle is the axle of choice to tow your rig straight and true.

Vibration fatigue is never going to happen on this axle loaded to 2.25t. Read about axle vibration fatigue here.

Couplemate manufacturers axles from BlueScope steel in our Wynnum, Brisbane workshops.

50mm Square Solid Axle rating

  • Holden Bearing Profile - 1,000kg Max
  • Ford Bearing Profile - 1,450kg Max
  • Dexter Bearing Profile - 1,590kg Max
  • Ford Parallel Bearing Profile - 1,600kg Max
  • Al-ko Bearing Profile - 2,250kg Max
  • Dexter Bearing Profile - 2,250kg Max
  • Al-ko Bearing Profile - 3,000kg Max

Note: Please advise your axle length, either tip-to-tip length or face-to-face measurement and axle profile after ordering. Example 2t, 3t, parallel, slimline.

So where does this steel come from?

Newcastle in New South Wales continues its rolling bar mill that pulls its feedstock from Whyalla in South Australia.

The other major arm of the Newcastle steel industry is Commonwealth Steel at Waratah, NSW. This wire works mill pulls its steel from 1000 car bodies per day.

Australian Steel is a fascinating story. Such a pity the Television media reporting on Australian success stories is not better supported.

Calculating The Correct Axle Measurements

  1. Measure the offset wheel. The wheel offset is the distance between the inside of the hub and the outside of the rubber.
  2. Add 50 mm to the offset. Alternatively, choose your own distance between the rubber and the chassis.
  3. Multiply by 2 for both sides. Add your chassis width to the above number.

Metric to Imperial Converter

Convert Imperial (inches) to metric (mm)

  • =

Still unsure of what measurements to take? Check out this handy guide below:

[P] - Check material specifications. What size and profile is the axle (for example, 45mm Square)
[T] - Overall axle length (tip to tip)
[F] - Hub face to hub face measurement
[A] - Chassis width
[C] - Tyre clearance
[B] - Back offset
[H] - Tyre to chassis
[G] - Axle pad centres

How To Measure An Axle

Identifying Bearing Combinations

You will also need to identify your bearing combination which can be done by pulling off a hub and bearings, and locating the number laser engraved onto the bearing. You will require both the inner and the outer bearing number.

Where to identify bearing number. Look for the laser engraved number on the bearing.

Other Common Problems and Tips:

If your 50mm square parallel trailer, caravan axle is not properly engineered you may experience excessive bearing wear.

  1. Rough seal journals can cause a loss of grease through the rear seal.
  2. Some suppliers supply non-virgin steel or scrap steel and forge this steel into a solid square or round shape for axle production. Always ask for Australian Steel.
  3. Chinese bearings are the second biggest cause of axle failure.
  4. If you plan to get onto a highway, use Japanese bearings.
  5. The combination of Japanese Bearings and a 50mm Square Axle will help you greatly with lower maintenance for your rig.
  6. Are your tandem tyres wearing unevenly?
  7. How to Align Caravan Wheels
  8. Axle Steel explained.


We rarely have problems with these larger kits.

A Couplemate assembled axle with Japanese bearings gives you our unconditional guarantee of a well made, well-backed axle assembly.

Caravan upgrades are explained here.

More axles and their maximum rating can be found here.

Caravan axles and their maximum rating.

50mm Square Axle Caravan Trailer Boat


    Be the first to review “50mm Square Axle”

    Your email address will not be published. Required fields are marked *